So let's see how many games can realistically be made in the first year of NX's lifecycle. I'll put equivalent games next to the ones released on Wii U, plus I'll only list one game funded by Nintendo made for every third party studios (i.e. Bayo 3 for Platinum Games), that's not counting portings (i.e. Smash4 NX from Banadai) and big companies such as Square, Bandai or Ubisoft. Also I'll consider when possible portings to be made from development teams outside of Nintendo since most of their portings are made by external teams such as Tanalus and Grezzo ( SMM has to be ported by Nintendo because it solely revolves on the levels saved on their servers and their older Mario games, but I'm shure such a port wouldn't take more than a couple months to be made...)
2012
New Super Mario Bros. U Super Mario Maker Port
Nintendo Land Mii focused game at launch (pretty much confirmed)
2013
LEGO City Undercover
Game & Wario
New Super Luigi U Super Mario Maker Port
Pikmin 3 Pikmin 4
The Wonderful 101
The Legend of Zelda: Wind Waker HD
Wii Party U
Wii Fit U
Mario & Sonic at the Sochi 2014 Olympic Winter Games
Super Mario 3D World 3D Mario Game
2014
Donkey Kong Country: Tropical Freeze Whatever Retro Studios is working on
Mario Kart 8 Mario Kart 9 (it should release in 2017 following the 3 year release they followed for years now...)
Wii Sports Club
Hyrule Warriors Dead or Alive : Extreme 3 Whatever Koei Tecmo can bring to NX, honestly I don't think they can do anything in 2 years...
Bayonetta* Bayonetta 3
Bayonetta 2 Bayonetta 3
Super Smash Bros. for Wii U Super Smash Bros 4 Port
Captain Toad: Treasure Tracker
NES Remix Pack
2015
Kirby & the Rainbow Curse
Mario Party 10
Splatoon Splatoon port
Super Mario Maker Super Mario Maker Port
Yoshi's Woolly World
Fatal Frame: Maiden of Black Water*
Animal Crossing: amiibo Festival
Mario Tennis: Ultra Smash
Xenoblade Chronicles X
Devil's Third
2016
The Legend of Zelda: Twilight Princess HD
Pokkén Tournament whatever Bandai can do for NX (I can't think of anything...)
Star Fox Zero
Star Fox Guard*
Tokyo Mirage Sessions #FE Whatever Atlus can bring to NX
Mario & Sonic at the Rio 2016 Olympic Games
Paper Mario: Color Splash
The Legend of Zelda Zelda U dual release
So there you have it, 23 titles are still to be filled, I have not counted what most of the internal teams at Nintendo could do excluding the 3D Mario, Mario Kart and the Nintendo Land sequel. It's to be noticed that many of the remaining titles are either portions of other titles/spin-offs related to minigames (for example Captain Toad). Moreover I don't know why LEGO City Undercover was counted and there are also a couple really bad games (Devil's Thurd, Mario Tennis, Amiibo Festival, I'm looking at you...)
